Originally Posted by praiseteamof2
Yes, I can change it to heat, floor windshield, or vent - move it anywhere. At present I have no A/C working on account of a freon leak. It seems like outside air coming in -steady too ..somehow.
I'M not sure of this but dosent the truck have a fresh air intake just in front of the windshild? I think this is shut ON and OFF by a door inside the system
Something I seen over at the Explorer fourm where thay had a problem with the door, and was letting cold air in all the time. Their fix was to remove the door and tape shut the air in take.
You could probley do a smoke test; turn the blower on full, see if it sucks smoke into the system.
Let us know how you came out.